/Engine/Source/Editor/MovieSceneTools/Public/MovieSceneToolHelpers.h
Trim or extend section at the given time
static void TrimOrExtendSection ( [UMovieSceneTrack](API\Runtime\MovieScene\UMovieSceneTrack) * Track, [TOptional](API\Runtime\Core\IO\TOptional)< int32 > RowIndex, [FQualifiedFrameTime](API\Runtime\Core\Misc\FQualifiedFrameTime) Time, bool bTrimOrExtendLeft, bool bDeleteKeys )